Luminosity Differences Between Halo Globular Clusters with Red and Blue Horizontal Branches

Details Luminosity Differences Between Halo Globular Clusters with Red and Blue Horizontal Branches Luminosity Differences Between Halo Globular Clusters with Red and Blue Horizontal Branches

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.6404v&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #64.04; Bulletin of the American Astronomical Society, Vol. 28, p.1354

Astronomy and Astrophysics

Astronomy

Scientific paper

Luminosity Differences Between Halo Globular Clusters with Red and Blue Horizontal Branches Sidney van den Bergh (HIA/DAO) Halo globular clusters with red horizontal branches [(B-R)/(B+V+R)<-0.80] have = -4.82, compared to = -7.30 for halo clusters with blue and intermediate-color horizontal branches. A Kolmogorov-Smirnov test shows that there is only a 0.1% chance that the red and blue HB clusters with RGC>10 kpc were drawn from the same parent population. This suggests that the luminosity function of halo globular clusters may have become fainter with time. Alternatively, it might be assumed that metal-rich halo clusters were formed with lower masses than metal-poor ones.

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